Author/Authors :
Sheikh, Ragaa El Department of Chemistry - Faculty of Science - Zagazig University, Zagazig, Egypt , Shaltout, Mohammed Department of Chemistry - Faculty of Science - Zagazig University, Zagazig, Egypt , Nabawy, Kamal El Department of Chemistry - Faculty of Science - Zagazig University, Zagazig, Egypt , Gouda, Ayman A Department of Chemistry - Faculty of Science - Zagazig University, Zagazig, Egypt
Abstract :
A new, cost-effective, and environmental-friendly cloud point extraction methodology was described for enrichment of water samples
containing copper, manganese and nickel. The method involves the complexation of copper, manganese or nickel with 2-amino-6-(1,3-
thiazol-2-diazeyl)-phenol at pH 7.0, then extraction into Triton X-114. After dilution of the surfactant-rich phase with acidified methanol,
the enriched analytes concentration was estimated by flame atomic absorption spectrometry. Parameters that influenced cloud point
extraction, such as pH, reagent, surfactant and nitric acid concentrations, centrifuge rate and time, temperature, incubation time, as well as
interferences were evaluated and optimized. The preconcentration factor was 100, enrichment factors were 14, 11.10 and 11.30 and the
detection limits were 0.37, 1.20 and 1.30 μg l-1 for copper, manganese, and nickel, respectively. The method presented relative standard
deviation as precision was found to be 2.20%, 2.50 and 3.20% for copper, manganese, and nickel, respectively. The accuracy of the new
preconcentration procedure was evaluated by the analysis of the standard reference materials (SRM 1570a Spinach Leaves and SRM 1515
Apple Leaves), and successfully applied to determine Cu2+, Mn2+ and Ni2+ in real water samples with relative recovery values in the range
of 95.0%-99.0% for the spiked samples.
Keywords :
Cloud point extraction , Copper , Manganese , Nickel , FAAS , Water
